The next morning, after we had cleared the ships of the tea, it was discovered that very considerable quantities of it was floating upon the surface of the water; and to prevent the possibility of any of its being saved for use, a number of small boats were manned by sailors and citizens, who rowed them into those parts of the harbor wherever the tea was visible, and by beating it with oars and paddles, so thoroughly drenched it, as to render its entire destruction inevitable.
The part about making sure all the tea was destroyed shows how determined they were. They didn’t want anyone using it or selling it. It makes sense that Britain reacted so strongly afterward with the Coercive Acts.